Temperature gauge problem

BOSNIANAC

MEMBER
AUDI A4

Hi, I just bought Audi A4 1999 turbo 4 cy with 72000 miles on it and the problem is that the temperature gauge takes long time like 30 - 40 min to rise to normal level that's when the car is at rest and when I start driving it stays at normal level for some time and then falls on C, is it possible that thermostat is stuck open also the fan the one behind the grills runs all the time when car is on. Please help thanks.

3 Replies

PEPPERMRJ

MECHANIC
1,158 POSTS

If the fan is constantly running that is why your temp gauge is slow to reach normal operating temperature. How is the heat in the cabin?

Normally the computer controls the running of the electric cooling fan based on the input of the coolant temperature sensor. It sends power to the relay, which in turn completes the circuit, thus starting the cooling fan.
I would check for a stuck relay, a wire shorted to 12 volts, or a bad engine coolant temperature sensor. Most autos turn the cooling fan on when the airconditioning is on also.

Good hunting and let us know. :)

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Sunday, February 26th, 2006 AT 2:02 PM

BOSNIANAC

MEMBER
7 POSTS

Heating works fine and everything else, I also have heated seats and that works fine to so the only thing is the temp gauge.

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Monday, February 27th, 2006 AT 7:54 PM

BOSNIANAC

MEMBER
7 POSTS

Hey guys I fixed the problem it was faulty thermostat it was stuck open just like I thought, thanks anyways for help you offered, by the way I think that this is the most useful and best web about car repair that you can find on internet.

Keep it up :D

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Thursday, March 2nd, 2006 AT 6:40 PM